1)  Item name: porcelain knife switch;
2)  Materials:

Body: porcelain base and bakelite cover
Knife: iron copper-coated, or copper;
Metal accessories: copper block or iron flake;

4)  Colour: yellow or blue cover;
5)  Package details:

 inner box and carton

the inner box can be yellow, blue, red etc.

6) other photos: